Are there any studies that prove that action text like "share this" near social share buttons increase sharing?
For example, would "share this" action text in the header encourage users to share more?
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Seems there are no much usability studies for this exactly. But there are two premisses that go in direction that with text there will be better performance:
A) Context / functionality will be clearer. There are number of studies that suggest labeling the icons works better https://uxplanet.org/unlabeled-icons-sacrificing-usability-to-look-pretty-415408a0e115
B) Element will be more visible with text addition. You could even extend wording to gain bit more visibility to "Share Article on Social media" or similar
And ofcourse, it will be very unlikely that placing text will kill the CR/CTR, so if there is no special cost for your layout to place it - it could be a smarter choice.