The Spanish giants confirmed the loan signing of the 31-year-old on Monday evening to bring finality to earlier speculation.
Barcelona also have an option to sign Boateng from Serie A side Sassuolo for a £7.1m fee in the summer.
The former AC Milan and Tottenham star becomes the first Ghanaian to play for Barcelona and his move has got social media buzzing.
Many Ghanaians did not really believe the rumours, but once Barca confirmed that move, Twitter has been flooded to reactions.
Here are some of the best tweets from Ghanaians on social media:
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