For a D2C brand, Instagram comments are mostly the same five questions. Price. Is this available. Do you deliver to my city. What sizes. Where do I order. Answering these by hand does not scale, and answering them late loses the sale, because purchase intent decays within hours.
Automation fits this problem precisely, because the questions are predictable and the answers are fixed. Map each question to a keyword and let the reply carry the answer plus the link to buy. Someone comments PRICE and receives the rate card and the product page. Someone comments SIZE and receives the size guide. The customer gets an answer in seconds and lands on a page where they can act.
Product catalogues make this sharper. Attaching a keyword to a specific product means the DM carries the right link rather than sending everyone to a homepage where they have to search again. Every extra step between interest and checkout costs conversions.
The follow-up is where most brands leave money behind. Someone who received a product link and did not buy is a warm lead with known intent. A single message a day later, referencing the specific product rather than a generic nudge, recovers a meaningful share. Send one. Do not send five.
Watch out for a mismatch between your ad and your DM. If a paid post promises a discount, the automated message must mention that discount. When the ad and the message disagree, people report the account and the campaign underperforms for reasons that look mysterious in the ad dashboard.
The number to track is revenue per hundred comments. It cuts through vanity metrics and tells you which posts and which keywords actually produce sales, which is what decides where your ad budget goes next month.