Hey @marcin - thanks for your article. In my case, Linkedin is also one of the most important channels, but I prefer to use my and my coworkers' personal accounts - it's much more effective.
Although you guys are right - Linkedin is quite spammy, but for me, it's still the cheapest and most comfortable promotion channel.
I believe that as well, if you focuse on Linkedin, and do the things with plan and right, that it can gain lot of results, especially in b2bm b2c. Like connecting only with right people, posting quality content, using platform features like Groups, company page, etc