Info about stumbleupon anti-spam algo. please

I want to do some selling on SU, but their anti spam algorithm is pretty BA. I log into an acct with a fresh, legit proxy and the next time it boots me. If I log in with another fresh proxy, or different ip, it will let me post but blocks the likes so...pretty much useless. I searched BHW for articles that talked about this and didn't really see any. Any info., and/or alternatives would be appreciated thanks!

Even now SU has a very severe anti-spam policy, and if they see any spamming activity from your side, such as generic posts/comments, or advertising of some sites, your profiles will be banned right away.
In case you have a trustful account for years and are doing smart advertising with a good interaction, these platform can generate you huge traffic from niche interested clients.

Social media is a waste of time unless you're buying accounts that already have friends. In my opinion, it's worse than trying to dig for gold.