I can't join more than 30 groups without being logged out by FB and then forced to phone verify my account. A week ago I could join 100 at a time and only get the (I'm paraphrasing) "Please slow down, it looks like you're using this feature in a way it wasn't supposed to be used" warning. I was never logged out of my account just for joining groups before today.
Simple said, they are improving their anti-spam measures and spam detection. Ask yourself, would normally engaged person join 30+ or 100 groups in a short period of time ? They know patterns and regular behavior, they track millions of accounts and they see very well what is normal and what is spam or at least suspicious behavior.
This is what happens when you use your unverified facebook account as a bot. Just make a few extra accounts and rotate them or actually verify some of them with your phone number.
Good advice. If you're going to spam then do it with tons of multiple accounts if you would like to stay under the radar.
Well I don't really want to mass spam, just looking to get something viral. Posting once using Hootsuite to 100 different groups would hopefully start the viral train.
