Huda al-Ajmi, 37, received the longest known sentence for online dissent in the Gulf state, according to Kuwaiti opposition groups.
She reportedly faced three separate charges that included insulting the Emir, Sheikh Sabah al-Ahmad al-Sabah, which carries a one-year sentence in itself.
The other two five-year prison terms were given for inciting rebellion against the regime and violating laws on public discussions.
Although Kuwait is more liberal than many Gulf states, authorities are increasingly cracking down on perceived dissent over social media.
Last month Mussallam al-Barrak, a former MP, was sentenced for five years for insulting the Emir but he managed to overturn the decision on appeal.
Mr al-Barrak had warned the Emir in a speech that he would not be allowed to 'take Kuwait into the abyss of autocracy'.
Recently two female activists were punished with lighter jail terms but ended up with suspended sentences.
Unrest flared up in Kuwait in December last year after the emir changed an electoral law in the run-up to a public vote.
Opposition parties said the move was intended to deny them a majority and they boycotted.
Ms al-Ajmi will be able to appeal her three sentences.
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