Posting on social media will not bring down your site's value in Google or any other search engine. It will in fact, increase the value of your site by increasing backlinks and quicker indexing of pages.
Just do not post to any fly-by-night social media sites, the bigger ones are awesome for promotions.
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Dont Go for Paid Events Because of Google Gave more important in Natural Submission only . Once upon a time i am also doing paid Search but no use. There are lot of major sites available like stumble upon , digg , delicious so submit major sites only
The best thing is to maintain a good presence in the social networking websites and some of the prominent social bookmarking websites. Make sure that you keep posting something on a regular basis for getting the best results.
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No. If you manually carry out the practise of social bookmarking then you'll present yourself as a human being and not a spammer to Google. The tools that you've mentioned above might help you but in the long run
Anything that automates your link across several sites is asking for trouble with the SE algorithms. Get involved at those sites and get linked where appropriate. To burst out links all over will be a red flag for the bots.
There have an auto-submissions services/programs since the inception of search engines. They know what to watch for nowadays...