Recently someone was struggling to get the count button to work on their twitter button.
They were using a shortening service other to twitters own (bit.ly). So when the tweet button was clicked the counter wasn't showing the number of shares.
The solution was to use data-counturl="full url" as well as the data-url="shortened url"
This posed an interesting question, if you set data-counturl to something like Google, what would happen?
Here is the code I used to generate two twitter buttons (one with no data-counturl and one with it set to google)
Here is the result
Turn outs that the button showed a count of over 100k, so I guess they cant be trusted.
No! Don't trust them.