I have the same complaints as everyone, though I think LinkedIn may not be so easy to replicate. If you think about it, they have basically made a voluntary res

I have the same complaints as everyone, though I think LinkedIn may not be so easy to replicate. If you think about it, they have basically made a voluntary resume board on which (I'd guess) a majority of professionals or close to it have posted their resumes. Most people just use it as a static site, but the business, and importantly the overall network effects that push people to add their profiles, are subsidized by the small group that posts all the crap that's on there. To replicate this, you'd need to find some other way to incentivize everyone to sign up (or at least for som niche). It can't just be the technical capability of adding a profile.