This year, the Tiananmen Square anniversary is further of note as it comes after pro-democracy protests filled the streets of Hong Kong last year. Hong Kong remembers the deadly 1989 incident with a candlelight vigil every year, though mentions of the memorial are also largely blocked in mainland China.
Related: Hong Kong remembers Tiananmen - but this year is different
By Thursday morning, the block on WeChat seems to have been partially lifted. Attempts by CNN to transfer money between Hong Kong and Beijing — and vice versa — appear to have succeeded, but it's unclear if payments within China are working.