Google doesnt find the links as soon as you post them. It can take weeks for google to find them, if they find all of them at all and lets then there is the removed factor. allot of links get removed before google see's them.
ya if you make too many links in a single day then it will hurt your site as google will think you are spamming..it might ban your site..
Blast away, keep it consisitent and use a mixture of Blogs, Forum profiles, articles and bookmarking sites