which viral script is the best right now?

hey, i didn't used scripts since a year, the last good one i remember was the "jaa" script

which ones are currently good and can you give me a good source to buy/get it?

i don't need scripts to build up fanpages, i just want get my niches viral ( i mean i dont need fanpage scripts or like generators or fun apps or whatever )

i heard something about a awesome like/comment script, does that still work?