Acts as an actin bundling protein (PubMed:1723709, PubMed:19729655). May have a role in the asymmetric organization and/or movement of cytoplasmic components (PubMed:1723709). It has a role in somatic cells during the formation of adult bristles and hairs, and in the female germline during oogenesis (PubMed:1723709, PubMed:19729655). Interacts with Rab35, with stronger binding to the Rab35-GTP form compared to the Rab35-GDP form. Belongs to the fascin family.