I also live in Gwinnett County, and I have a few points to make/questions.
1) Staying up late the night before-- Tosha's FB says she is a manager-in-training for a restaurant. Do we have anyone who can confirm this? If so, as a former restaurant manager myself, I would say that it is perfectly common to stay up late when one has that kind of a job. I have been up many nights until the sun was shining into my window the next morning. Just check out some of the times I have made posts on Websleuths for proof of that! However, the rapid posting of selfies for a period of hours is not normal. Some of the pics were duplicates. She did the same thing on October 5th, but just not as many pics. My FB doesn't seem to be cooperating enough right now for me to see if she has also done this selfie-posting thing on dates prior to that.
2) Getting VERY lost on the way to Blue Ridge (part 1-the highway)-- Normally a route from Gwinnett County to Blue Ridge would start off by heading north on I-985 until it kind of ends and you just follow the signs until you end up in Cleveland, GA and then go from there. There is no reason she should have ended up on I-85 N instead of I-985 if she was using her GPS from the beginning, UNLESS she had somehow chosen directions to Blue Ridge, South Carolina instead of Georgia. Probably not likely, but indeed it is possible. That would put her on I-85, but it should have been a long enough estimated arrival time that she should have noticed it was incorrect. If that's not what happened, and it was just an error, she went 64 miles north past her exit before she realized she was lost. That is a really long way to go in the wrong direction. The exit for I-985 off of I-85 is one of those left-side exits, which sometimes confuses people who are looking to exit to the right. There are big overhead signs showing you which highway is forking in which direction, but it's hard to say where she actually got onto the highway without knowing from where in Buford she started. But WHY would she say she was in Toccoa (really probably at the Lavonia/Toccoa exit) a little after 8pm, and get another ping in the area more than 3 hrs later? I just drove through this area on Saturday night, and I wish I had paid more attention to what exactly is at this exit.
3) Getting very lost (Part 2-off the highway)-- The drive from Lavonia to Blue Ridge is gonna be really dark and quiet that time of the night, even on a Friday. I noticed so many stars just looking out through the car window driving through there last night, because it is really not near anything. I would never want to drive that whole route at night if I was unfamiliar with the area, and I'm pretty good with directions. In the radio interview linked above, Tosha's sister Stacie says they "had some evidence" that Tosha had made it across highway 17 in Toccoa so that is what led to them taking the most likely route and then later finding her car. Could the evidence have been the rumored ping in Demorest? Because that one was supposedly at 9pm. Toccoa/Lavonia at 8:12pm and then Demorest at 9 is a realistic timeline. So I'm feeling like that later ping is probably an error.
4) Finding the car--How the heck did her family find the car down a 150-ft ravine on a route where the car could be anywhere along a 2-hr drive? This is amazing! Tosha is lucky she has such a devoted, caring, and SMART family helping search for her! I love this family!
5) After the accident--This is a Maura Murray/Bryce Laspisa (and unfortunately many others) type of mystery at this point. She survived the accident, only to disappear quickly afterward. That car looks awful! I'm sure her family feared they would find her body inside the car when they first saw what kind of shape it was in down that ravine. I was in a very minor but disorienting accident when I was just beginning to drive. The car had flipped but righted itself, and it came to a stop on the same side of the road but heading the direction from which I had come. I did not understand that I was facing a different way. So I wanted to start walking towards a payphone in the wrong direction (before cell phones). I would have made it home before I got to a payphone, but luckily a neighbor saw me, stopped to see if I was OK, and then drove to my house to tell my parents. When I saw her head off I thought she was heading towards the payphone. I kept looking down the street waiting for my parents to arrive, but they sneaked up behind me. "What are you guys doing coming from that way?" I asked them. They were confused as to what was making me so confused, but I was totally fine physically and mentally. I just didn't understand why I would be facing the opposite direction from where I had been heading. This was on my way to school, in daylight, less than 2 miles from my house. I had lived there for 16 years. Tosha was on a strange road, in the dark, and her car went 150 feet down a ravine, in the middle of nowhere. I'm curious what lights might be visible from that area at night. Most people head towards lights when they are lost in the dark. Her sister says the mountain was "cleared" and they had used cadaver dogs to search the area. I don't know if they only used cadaver dogs, but they need to use tracker dogs as well to figure out which direction she walked when she left the accident scene.
6) Conspiracy theory alert--Could someone have seen her stop somewhere, heard her say she was lost, and caused the accident so they could "rescue" her? Or did someone try to get her to stop her car so they could grab her, and then they faked the crash? Not likely, but it's also not likely that she herself faked that serious of an accident so she could run away to Gainesville, cut and dye her hair, and have a new identity. But then, what's with all the FB selfies? Trying to post a lot of pics with long hair so that would be what people search for instead of her new look?
I think this will turn out to be more of a Teleka Patrick thing. Search the area near where her car was found again. Any bodies of water? I think that's where she is.