SharePulse ranks in a widget your site's posts which have had the greatest share count, using Twitter, LinkedIn, Facebook and your comments.
Earlier versions of SharePulse had relied on APIs that just weren’t reliable. It’s been rebuilt from the ground up to rely on the same tech that powers the share buttons. We’re hoping that this will be the magic sauce that keeps it working.
The short answer: SharePulse relies on the stats from different APIs (Application Programming Interface) they sometimes take a while to process the data.
Feel free to contact me. Praise, suggestions, comments and especially bugs found are welcome.