A drop-in replacement for Twitter’s deactivated unofficial share count API
opensharecount.com
opensharecount.com
My guess is that they'll be back, but only if you pay for some service they'll offer.
I'm guessing we'll see how much of what @jack said about twitter being more developer friendly is now by seeing how long this stays up.
[0] https://blog.twitter.com/2015/hard-decisions-for-a-sustainab...
1. "Before getting involved, it’s important to know that the Search API is focused on relevance and not completeness. This means that some Tweets and users may be missing from search results. If you want to match for completeness you should consider using a Streaming API instead." https://dev.twitter.com/rest/public/search
I don't know how incomplete the search results are but for most sites this should be enough to give a relative idea of the popularity of their posts. And in any case, I only built it in this way because this was the way Twitter suggested for getting information about links in the announcement they made about shutting down the share counter.
https://cdn.api.twitter.com/1/urls/count.json?url=http://www...
"Sorry, that page does not exist"
Which is the problem that this site is trying to solve.