Generally, people you care about won't see your Weibo, but people who care about you and people who care about each other can. But because many people pay attention to you, many people are posting about Weibo every day. Too many people probably can't tell. If you really want the other party to see it, just add the name @ Weibo at the end of Weibo, so that the other party can receive the news that you mentioned him in Weibo.