in as many sites u can, but dont post too in a singe day. post few posts or few links in directory or bookmarking in 5-10 sites only per day.. http://www.TrafficHeat.com/ http://www.SeoVisa.com/ http://www.keeptraffic.com/ http://www.pagesfan.com/ http://www.blogswala.com/ http://www.Blinklist.in/ http://www.LinkArena.in/
You can post in as many sites but you have to make sure the quality of the content you post, it should be high quality and unique content, posting duplicate content can be really damaging for your website's rankings.