Many of these third-party "FBSub" apps request "Developer Access" to your Facebook account. Granting this allows them to post as you, read your messages, and hijack your ad accounts. There have been thousands of cases of identity theft via "free liker" apps.
While these tools can temporarily boost numbers, they come with significant drawbacks: fbsub liker facebook
Small business owners don't have 4 hours a day to engage in comment pods or viral marketing. They look for shortcuts. Many of these third-party "FBSub" apps request "Developer