I feel like Twitter is the obnoxious, unfortunate, and true answer to this question. In both NLP and Robotics, Twitter is a great way to keep up with the field. Here are some great #RoboNLP-related PIs to get started in a tiny corner of academic Twitter (please note that this is a pitifully small sample):
In your Twitter bio, I suggest a (super brief) set of research interests, your current level and location (e.g., UGrad @ Uni), and maybe a quick action statement (e.g., "I am looking for PhD programs in X"). Linking out to your personal website (and creating a personal website!) is also helpful. I try to follow-back accounts that I can identify easily as students.
Additionally, there are a number of affinity groups drawing together marginalized communities within AI / CS / academia. These groups hold networking and workshop-like events at conferences, and maintain social media (e.g., Twitter) and digital community spaces (e.g., Slack).
For those thinking about whether to apply to PhD programs, I was involved in a
PhD recruiting event that remains active as a Discord server to network with other students thinking about the same.