For our epidemiologic reasearch study we need to analyze twitter and facebook activity for a given structured query, for example:
(prenatale OR preconcezionale OR gravidanza OR concepimento) AND (folati OR folico OR folina OR folina)
This query would screen for posts and tweets specific about pregnancy and folic acid.
I inspected various services, among them https://pro.topsy.com is indeed the most usefull for what we need (although it covers twitter only), but the price point is too high for no-profit projects like ours, ranging around 12000$ per year.
Is there any good service that could work out well for us?