Website promotion VKontakte?

Question

Search Engine Optimization

Good afternoon.
I'm trying to promote the VKontakte site and have already created a group. The questions are:
1) The maximum number of links in a group is 100 pcs. What to do if this limit is reached?
2) What is the limit for links on the personal page?
3) Do systems index such links from the group and page?
4) I have a hundred friends soon, how many do I need to get to promote?
...
And I will add one more question, what can such a promotion in numbers give?

Answer 1

"what can give such a promotion in numbers" -
without investments round 0