as islandman said, most important thing is do some other shit!! Dont even worry about trying to figure out the limit of joining groups, if you are not doing other shit it doesnt matter!!
If you do other shit, you can get away with more other shit, as it looks like normal users doing shit.
Always remember that, to keep an account alive, make it look as close to a real account as possible. How many real FB users ONLY join tons of groups/post to tons of groups?
Second, the golden rule of botting any social network = Less actions across more accounts. Dont increase the amount of groups you join, but increase the amount of accounts joining groups.
If you do other shit, you can get away with more other shit, as it looks like normal users doing shit.
Always remember that, to keep an account alive, make it look as close to a real account as possible. How many real FB users ONLY join tons of groups/post to tons of groups?
Second, the golden rule of botting any social network = Less actions across more accounts. Dont increase the amount of groups you join, but increase the amount of accounts joining groups.