Is full tilt poker rigged

No,

Poker sites are not rigged at all. They have no reason to "rig it".

Why?
Because poker sites earn their money by the rake's and tournament fee's in cash games and tournaments. (Rake = the small percentage of the pot going to "the house" (pokersite)). If you lose your money in a hand, that money goes directly to the other player. And that player is - like you - another poker player.

People will often claim a poker side is "rigged" because of them suffering a bad beat, or just not knowing how to play correctly and losing their money. They think/say the site is rigged because they lost their money while gambling and are frustrated because of it.