^He's not an SEO consultant. But I can tell you it's very unlikely that this service did that. I've been doing social bookmarking for years and years across dozens of sites and I've ordered from the OP probably 5 times by now and I've never seen a site hurt by this. This is the safest linkbuilding you can do. If you've been doing a lot of linkbuilding recently Google may pull the site back for a little bit before shooting you back up, but it depends on how good you are at linkbuilding. Personally I've figured out a system that never drops my site back like that and if you keep at it you will too.