I ran some tests maybe a year ago, FB, Twitter promotion mostly. I tried a couple of the best seller gigs. Pretty much all of the gigs will give you zero benefits, bot traffic at best. One seller went to the extent that he sent fake traffic to the tracking url, but he fucked it up, because he forgot to fake the referer or simply wasn't aware. Little did he know, that i'm not his average Fiverr buyer and i saw pretty much every trick in the book. lol
Although all gigs were good for my purpose, because i was in a situation, where i only needed proof that the traffic was sent, but if you actually expect results, let alone sales from Fiverr social media promotions, i think you'll be disappointed.