With far fewer Tamazight speakers than Morocco or Algeria or even Libya, Tunisian Imazighen have enjoyed little awareness among their countrymen; while most North Africans may well be of Amazigh ancestry, the language is spoken in Tunisia today only on the island of Djerba and a few small localities in the south of the country. Besides those four countries, Amazigh languages are also spoken in the Siwa Oasis of Egypt and in Mauritania as well as among the Tuareg across a wide swath of the Saharan countries.
But Tunisian activism has been growing. A cultural association was formed last year and increasingly, activists have been getting more press coverage; activist Ines Fezzani, quoted in the last link, is active on Twitter (@TunisianAmazigh) and on the "Reviving Amazigh Identity Facebook page, which covers news from all the Maghreb countries. There's a Tunisian-specific Amazigh website (in French) from the town of Tamazret here.
And here's a music video with photos celebrating the Imazighen of Tunisia.