What online services for promotion in social networks are optimal and relevant?

Question

Search Engine Optimization

We were asked to consult mlm-schikov on doing business in the network. And since for the most part they are not particularly friendly with it, the question arose about the availability of paid (or maybe there are free) services for promotion in the social network.
We are talking about mailings, invitations and other promotional products.
I know how to use the search, but a lot of slag. If you have experience, please advise.

Answer 1

For Instagram:

• Findgram (analytics, collection of the target audience from VK and inst)
  
• Aitarget (setting up targeted advertising)
  
• Instaplus (promotion, direct mailing)
  
• Getip.social (proxy servers)
  
• SMMPlanner (auto-posting)
  

Answer 2

Good afternoon !!)) Please tell me where to go and how to do it correctly in order to add more "friends" to classmates. I've read that pages that promote ads or products can add up to 10,000 "friends". A little about myself: I work in a furniture store and deal with social networks and their promotion, but the skills, like any other user, are primary .... Help me figure out this question please!))