Yes, it looks like there is an invasion of bots. Today, several hours ago, somebody started to follow me. I got the notification, I didn't know the username, I never communicated with that person before, so I didn't know why they started to follow me. I checked their profile, and found out that they joined today, and their profile picture was a picture of a naked woman holding a sign that was inviting people to join some site for sexchats. So I was thinking: "That looks like a bot". I decided to log out and wait, and check later if that person will post anything. I logged back in some hours later and that profile is gone.